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https://www.readbyqxmd.com/read/27896310/preservation-of-essential-odor-guided-behaviors-and-odor-based-reversal-learning-after-targeting-adult-brain-serotonin-synthesis
#1
Kaitlin S Carlson, Meredith S Whitney, Marie A Gadziola, Evan S Deneris, Daniel W Wesson
The neurotransmitter serotonin (5-HT) is considered a powerful modulator of sensory system organization and function in a wide range of animals. The olfactory system is innervated by midbrain 5-HT neurons into both its primary and secondary odor-processing stages. Facilitated by this circuitry, 5-HT and its receptors modulate olfactory system function, including odor information input to the olfactory bulb. It is unknown, however, whether the olfactory system requires 5-HT for even its most basic behavioral functions...
September 2016: ENeuro
https://www.readbyqxmd.com/read/27869229/tetratricopeptide-repeat-domain-9a-modulates-anxiety-like-behavior-in-female-mice
#2
Lee Wei Lim, Smeeta Shrestha, Yu Zuan Or, Shawn Zheng Kai Tan, Hwa Hwa Chung, Yang Sun, Chew Leng Lim, Sharafuddin Khairuddin, Thomas Lufkin, Valerie Chun Ling Lin
Tetratricopeptide repeat domain 9A (TTC9A) expression is abundantly expressed in the brain. Previous studies in TTC9A knockout (TTC9A(-/-)) mice have indicated that TTC9A negatively regulates the action of estrogen. In this study we investigated the role of TTC9A on anxiety-like behavior through its functional interaction with estrogen using the TTC9A(-/-) mice model. A battery of tests on anxiety-related behaviors was conducted. Our results demonstrated that TTC9A(-/-) mice exhibited an increase in anxiety-like behaviors compared to the wild type TTC9A(+/+) mice...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27866207/post-stroke-fatigue-may-be-associated-with-the-promoter-region-of-a-monoamine-oxidase-a-gene-polymorphism
#3
Smi Choi-Kwon, Mihye Ko, Sang-Eun Jun, Juhan Kim, Kyung-Hee Cho, Hyun-Wook Nah, Hasup Song, Jong S Kim
BACKGROUND: Post-stroke fatigue (PSF) is a common sequela of stroke. Despite reports of serotonergic involvement in the etiology of PSF, the potential contribution of serotonergic genes in the development of PSF needs to be investigated. METHODS: A total of 373 patients, who experienced ischemic stroke for PSF, were evaluated 3 months after the stroke. PSF was assessed using the Fatigue Severity Scale. The genomic DNA collected and stored in a -70°C freezer was genotyped for 6 polymorphisms in genes associated with serotonin synthesis (tryptophan hydroxylase 1 (TPH1) A218C, TPH2 rs10879355, and TPH2 rs4641528), transport (the promoter region of the serotonin transporter protein), and catabolism (the 30-bp functional variable number tandem repeat) polymorphism in the promoter region of monoamine oxidase A (MAO-A)...
November 19, 2016: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/27824354/serotonergic-modulation-of-waiting-impulsivity-is-mediated-by-the-impulsivity-phenotype-in-humans
#4
S Neufang, A Akhrif, C G Herrmann, C Drepper, G A Homola, J Nowak, J Waider, A G Schmitt, K-P Lesch, M Romanos
In rodents, the five-choice serial reaction time task (5-CSRTT) has been established as a reliable measure of waiting impulsivity being defined as the ability to regulate a response in anticipation of reinforcement. Key brain structures are the nucleus accumbens (NAcc) and prefrontal regions (for example, pre- and infralimbic cortex), which are, together with other transmitters, modulated by serotonin. In this functional magnetic resonance imaging study, we examined 103 healthy males while performing the 5-CSRTT measuring brain activation in humans by means of a paradigm that has been widely applied in rodents...
November 8, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27807918/local-gyrification-index-in-patients-with-major-depressive-disorder-and-its-association-with-tryptophan-hydroxylase-2-tph2-polymorphism
#5
Kyu-Man Han, Eunsoo Won, June Kang, Aram Kim, Ho-Kyoung Yoon, Hun Soo Chang, Kyu Ri Son, Min-Soo Lee, Woo-Suk Tae, Byung-Joo Ham
The tryptophan hydroxylase-2 (TPH2) gene is considered a promising genetic candidate regarding its association with a predisposition to major depressive disorder (MDD). Local gyrification reflects the early neural development of cortical connectivity, and is regarded as a potential neural endophenotype in psychiatric disorders. They aimed to investigate the alterations in the cortical gyrification of the prefrontal cortex and anterior cingulate cortex and their association with the TPH2 rs4570625 polymorphism in patients with MDD...
November 3, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27761358/stabilization-of-tryptophan-hydroxylase-2-by-l-phenylalanine-induced-dimerization
#6
Kasper D Tidemand, Hans E M Christensen, Niclas Hoeck, Pernille Harris, Jane Boesen, Günther H Peters
Tryptophan hydroxylase 2 (TPH2) catalyses the initial and rate-limiting step in the biosynthesis of serotonin, which is associated with a variety of disorders such as depression, obsessive compulsive disorder, and schizophrenia. Full-length TPH2 is poorly characterized due to low purification quantities caused by its inherent instability. Three truncated variants of human TPH2 (rch TPH2; regulatory and catalytic domain, NΔ47-rch TPH2; truncation of 47 residues in the N terminus of rch TPH2, and ch TPH2; catalytic domain) were expressed, purified, and examined for changes in transition temperature, inactivation rate, and oligomeric state...
October 2016: FEBS Open Bio
https://www.readbyqxmd.com/read/27699247/pka-regulatory-subunit-1a-inactivating-mutation-induces-serotonin-signaling-in-primary-pigmented-nodular-adrenal-disease
#7
Zakariae Bram, Estelle Louiset, Bruno Ragazzon, Sylvie Renouf, Julien Wils, Céline Duparc, Isabelle Boutelet, Marthe Rizk-Rabin, Rossella Libé, Jacques Young, Dennis Carson, Marie-Christine Vantyghem, Eva Szarek, Antoine Martinez, Constantine A Stratakis, Jérôme Bertherat, Hervé Lefebvre
Primary pigmented nodular adrenocortical disease (PPNAD) is a rare cause of ACTH-independent hypercortisolism. The disease is primarily caused by germline mutations of the protein kinase A (PKA) regulatory subunit 1A (PRKAR1A) gene, which induces constitutive activation of PKA in adrenocortical cells. Hypercortisolism is thought to result from PKA hyperactivity, but PPNAD tissues exhibit features of neuroendocrine differentiation, which may lead to stimulation of steroidogenesis by abnormally expressed neurotransmitters...
September 22, 2016: JCI Insight
https://www.readbyqxmd.com/read/27695066/a-novel-interaction-between-tryptophan-hydroxylase-2-tph2-gene-polymorphism-rs4570625-and-bdnf-val66met-predicts-a-high-risk-emotional-phenotype-in-healthy-subjects
#8
Maeson S Latsko, T Lee Gilman, Lindsey M Matt, K Maria Nylocks, Karin G Coifman, Aaron M Jasnow
Poor inhibitory processing of negative emotional content is central to many psychiatric disorders, including depression and anxiety. Moreover, increasing evidence suggests that core aspects of emotion-inhibitory processing are largely inherited and as such may represent a key intermediate or risk-related phenotype for common affective diseases (e.g., unipolar depressive, anxiety disorders). The current study employed a candidate-gene approach in order to most effectively examine this complex behavioral phenotype...
2016: PloS One
https://www.readbyqxmd.com/read/27660918/pharmacogenetic-study-focused-on-fluoxetine-pharmacodynamics-in-children-and-adolescent-patients-impact-of-the-serotonin-pathway
#9
Sergi Mas, Ana Blázquez, Natalia Rodríguez, Daniel Boloc, Amalia Lafuente, Joan A Arnaiz, Luisa Lázaro, Patricia Gassó
OBJECTIVE: Pharmacogenetic studies of fluoxetine in children and adolescents are scarce. After reporting the effect of genetic variants in genes related to the fluoxetine pharmacokinetics on clinical response in a pediatric population, we now evaluate the impact of genetic markers involved in its pharmacodynamics. PATIENTS AND METHODS: The assessment was performed in 83 patients after 12 weeks of fluoxetine treatment. The genetic association analysis included a total of 316 validated single nucleotide polymorphisms in 45 candidate genes involved in six different pathways...
November 2016: Pharmacogenetics and Genomics
https://www.readbyqxmd.com/read/27536220/firing-properties-of-genetically-identified-dorsal-raphe-serotonergic-neurons-in-brain-slices
#10
Boris Mlinar, Alberto Montalbano, Lukasz Piszczek, Cornelius Gross, Renato Corradetti
Tonic spiking of serotonergic neurons establishes serotonin levels in the brain. Since the first observations, slow regular spiking has been considered as a defining feature of serotonergic neurons. Recent studies, however, have revealed the heterogeneity of serotonergic neurons at multiple levels, comprising their electrophysiological properties, suggesting the existence of functionally distinct cellular subpopulations. In order to examine in an unbiased manner whether serotonergic neurons of the dorsal raphe nucleus (DRN) are heterogeneous, we used a non-invasive loose-seal cell-attached method to record α1 adrenergic receptor-stimulated spiking of a large sample of neurons in brain slices obtained from transgenic mice lines that express fluorescent marker proteins under the control of serotonergic system-specific Tph2 and Pet-1 promoters...
2016: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/27522569/a-comparison-of-biomarker-responses-in-juvenile-diploid-and-triploid-african-catfish-clarias-gariepinus-exposed-to-the-pesticide-butachlor
#11
Ali Karami, Dzolkhifli Omar, James M Lazorchak, Chee Kong Yap, Zailina Hashim, Simon C Courtenay
Influence of waterborne butachlor (BUC), a commonly used pesticide, on morphometric, biochemical, and molecular biomarkers was evaluated in juvenile, full sibling, diploid and triploid African catfish (Clarias gariepinus). Fish were exposed for 21 days to one of three concentrations of BUC [mean measured µg/L: 22, 44 or 60]. Unexposed (control) triploids were heavier and longer and had higher visceral-somatic index (VSI) than diploids. Also, they had lighter liver weight (HSI) and showed lower transcript levels of brain gonadotropin-releasing hormone (GnRH), aromatase (cyp191b) and fushi tarazu-factor (ftz-f1), and plasma testosterone levels than diploids...
August 11, 2016: Environmental Research
https://www.readbyqxmd.com/read/27521242/tph-2-polymorphisms-interact-with-early-life-stress-to-influence-response-to-treatment-with-antidepressant-drugs
#12
Zhi Xu, Gavin P Reynolds, Yonggui Yuan, Yanyan Shi, Mengjia Pu, Zhijun Zhang
BACKGROUND: Variation in genes implicated in monoamine neurotransmission may interact with environmental factors to influence antidepressant response. We aimed to determine how a range of single nucleotide polymorphisms (SNPs) in monoaminergic genes influence this response to treatment and how they interact with childhood trauma and recent life stress in a Chinese sample. An initial study of monoaminergic coding region SNPs identified significant associations of TPH2 and HTR1B SNPs with treatment response that showed interactions with childhood and recent life stress respectively (Xu et al, 2012)...
August 12, 2016: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27509352/impulsive-choices-in-mice-lacking-imprinted-nesp55
#13
C L Dent, T Humby, K Lewis, A Plagge, R Fischer-Colbrie, J F Wilkins, L S Wilkinson, A R Isles
Genomic imprinting is the process whereby germline epigenetic events lead to parent-of-origin specific monallelic expression of a number of key mammalian genes. The imprinted gene Nesp is expressed from the maternal allele only and encodes for Nesp55 protein. In the brain, Nesp55 is found predominately in discrete areas of the hypothalamus and midbrain. Previously, we have shown that loss of Nesp55 gives rise to alterations in novelty-related behaviour. Here, we extend these findings and demonstrate, using the Nesp(m/+) mouse model, that loss of Nesp55 leads to impulsive choices as measured by a delayed-reinforcement task, whereby Nesp(m/+) mice were less willing to wait for a delayed, larger reward, preferring instead to choose an immediate, smaller reward...
November 2016: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/27479537/suicide-behavior-as-a-quantitative-trait-and-its-genetic-background
#14
Joanna Pawlak, Monika Dmitrzak-Weglarz, Monika Wilkosc, Aleksandra Szczepankiewicz, Anna Leszczynska-Rodziewicz, Dorota Zaremba, Pawel Kapelski, Aleksandra Rajewska-Rager, Joanna Hauser
INTRODUCTION: Studies have not given yet a clear answer what is the genetic background of suicidal predisposition. The associations between polymorphisms of the TPH1 and 5-HTTLPR genes and violent suicidal behavior was revealed with the least inconsistencies. METHOD: We selected 10 "strong candidate genes" and 35 SNPs, SLC6A4 and ACP1 for replication study. We searched associations between precisely described suicidal phenotype in 825 affective patients and polymorphisms of selected neurobiological pathways genes as well as their interactions that constitute suicidal risk...
July 19, 2016: Journal of Affective Disorders
https://www.readbyqxmd.com/read/27451000/virgin-microplastics-cause-toxicity-and-modulate-the-impacts-of-phenanthrene-on-biomarker-responses-in-african-catfish-clarias-gariepinus
#15
Ali Karami, Nicholas Romano, Tamara Galloway, Hazilawati Hamzah
Despite the ubiquity of microplastics (MPs) in aquatic environments and their proven ability to carry a wide variety of chemicals, very little is known about the impacts of virgin or contaminant-loaded MPs on organisms. The primary aim of this study was to investigate the impacts of virgin or phenanthrene (Phe)-loaded low-density polyethylene (LDPE) fragments on a suite of biomarker responses in juvenile African catfish (Clarias gariepinus). Virgin LDPE (50 or 500µg/L) were preloaded with one of two nominal Phe concentrations (10 or 100µg/L) and were exposed to the fish for 96h...
July 21, 2016: Environmental Research
https://www.readbyqxmd.com/read/27416040/molecular-signaling-and-dysfunction-of-the-human-reactive-enteric-glial-cell-phenotype-implications-for-gi-infection-ibd-poi-neurological-motility-and-gi-disorders
#16
Andromeda Liñán-Rico, Fabio Turco, Fernando Ochoa-Cortes, Alan Harzman, Bradley J Needleman, Razvan Arsenescu, Mahmoud Abdel-Rasoul, Paolo Fadda, Iveta Grants, Emmett Whitaker, Rosario Cuomo, Fievos L Christofi
BACKGROUND: Clinical observations or animal studies implicate enteric glial cells in motility disorders, irritable bowel syndrome, inflammatory bowel disease, gastrointestinal (GI) infections, postoperative ileus, and slow transit constipation. Mechanisms underlying glial responses to inflammation in human GI tract are not understood. Our goal was to identify the "reactive human enteric glial cell (rhEGC) phenotype" induced by inflammation, and probe its functional relevance. METHODS: Human enteric glial cells in culture from 15 GI-surgical specimens were used to study gene expression, Ca, and purinergic signaling by Ca/fluo-4 imaging and mechanosensitivity...
August 2016: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/27402561/intermittent-hypoxia-promotes-recovery-of-respiratory-motor-function-in-spinal-cord-injured-mice-depleted-of-serotonin-in-the-central-nervous-system
#17
Dragana Komnenov, Julia Z Solarewicz, Fareeza Afzal, Kwaku D Nantwi, Donald M Kuhn, Jason H Mateika
We examined the effect of repeated daily exposure to intermittent hypoxia (IH) on the recovery of respiratory and limb motor function in mice genetically depleted of central nervous system serotonin. Electroencephalography, diaphragm activity, ventilation, core body temperature, and limb mobility were measured in spontaneously breathing wild-type (Tph2(+/+)) and tryptophan hydroxylase 2 knockout (Tph2(-/-)) mice. Following a C2 hemisection, the mice were exposed daily to IH (i.e., twelve 4-min episodes of 10% oxygen interspersed with 4-min normoxic periods followed by a 90-min end-recovery period) or normoxia (i...
August 1, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27346841/maternal-exposure-to-ochratoxin-a-targets-intermediate-progenitor-cells-of-hippocampal-neurogenesis-in-rat-offspring-via-cholinergic-signal-downregulation-and-oxidative-stress-responses
#18
Takeshi Tanaka, Yasuko Hasegawa-Baba, Yousuke Watanabe, Sayaka Mizukami, Yumi Kangawa, Toshinori Yoshida, Makoto Shibutani
To elucidate the developmental exposure effects of ochratoxin A (OTA) on postnatal hippocampal neurogenesis, pregnant SD rats were provided a diet containing 0, 0.12, 0.6, or 3.0ppm OTA from gestation day 6 to day 21 on weaning after delivery. Offspring were maintained through postnatal day (PND) 77 without OTA exposure. At 3.0ppm, offspring of both sexes showed a transient body weight decrease after weaning. Changes in hippocampal neurogenesis-related parameters as measured in male PND 21 offspring were observed at 3...
June 23, 2016: Reproductive Toxicology
https://www.readbyqxmd.com/read/27302625/5-hydroxytryptophan-a-precursor-for-serotonin-synthesis-reduces-seizure-induced-respiratory-arrest
#19
Honghai Zhang, Haiting Zhao, Xiaoxuan Yang, Qingsheng Xue, Joseph F Cotten, Hua-Jun Feng
OBJECTIVE: The DBA/1 mouse is a relevant animal model of sudden unexpected death in epilepsy (SUDEP), as it exhibits seizure-induced respiratory arrest (S-IRA) evoked by acoustic stimulation, followed by cardiac arrhythmia and death. Defects in serotonergic neurotransmission may contribute to S-IRA. The tryptophan hydroxylase-2 (TPH2) enzyme converts L-tryptophan to 5-hydroxytryptophan (5-HTP), a precursor for central nervous system (CNS) serotonin (5-HT) synthesis; and DBA/1 mice have a polymorphism that decreases TPH2 activity...
August 2016: Epilepsia
https://www.readbyqxmd.com/read/27239851/-influence-of-chronic-alcohol-treatment-on-the-expression-of-the-bdnf-bax-bcl-xl-and-casp3-genes-in-the-mouse-brain-role-of-the-c1473g-polymorphism-in-the-gene-encoding-tryptophan-hydroxylase-2
#20
D V Bazovkina, A S Tsybko, E A Filimonova, T V Ilchibaeva, V S Naumenko
Tryptophan hydroxylase 2 (Tph-2) is the key enzyme in serotonin biosynthesis. Serotonin is one of the main neurotransmitters involved in the regulation of various physiological functions and behavior patterns. The influence of chronic ethanol consumption on the expression of the Bdnf, Bax, Bcl-xL, and CASP3 genes was studied in the brain structures of B6-1473C (C/C) and B6-1473G (G/G) mice that had been obtained on the base of the C57BL/6 strain. The strains differed in the genotype for the C1473G single nucleotide polymorphism in the Tph-2 gene and in Tph-2 enzyme activity...
March 2016: Molekuliarnaia Biologiia
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